From Harvard Classics

"The order of the garter therefore was devised in the time of King Edward the
Third, and (as some write) upon this occasion. The queen’s majesty then
living, being departed from his presence the next way toward her lodging, he
following soon after happened to find her garter, which slacked by chance and
so fell from her leg, unespied in the throng by such as attended upon her. His
grooms and gentlemen also passed by it, as disdaining to stoop and take up
such a trifle: but he, knowing the owner, commanded one of them to stay and
reach it up to him. “Why, and like your grace,” saith a gentleman, “it is but
some woman’s garter that hath fallen from her as she followed the queen’s
majesty.” “Whatsoever it be,” quoth the king, “take it up and give it me.” So
when he had received the garter, he said to such as stood about him: “You, my
masters, do make small account of this bule garter here,” and therewith held it
out, “but, if God lend me life for a few months, I will make the proudest of
you all to reverence the like.” And even upon this slender occasion he gave
himself to the devising of this order. Certes, I have not read of anything that
having had so simple a beginning hath grown in the end to so great honour and
estimation…. 7"

I searched, but could not find definition of "bule". Can you?